Frame for a respiratory mask



FIG. 1 is a perspective view of a frame for a respiratory mask according to an embodiment of our design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof; and,

FIG. 4 is a right side view thereof with the left side view being a mirror image thereof.

Where included, broken lines showing environment or structure are for illustrative purposes and form no part of the claimed design.

Where included, dotted lines indicate the border between claimed and unclaimed subject matter and form no part of the claimed design. 

The ornamental design for a frame for a respiratory mask, as shown and described. 